A notification is a message that we can display to the user outside of our application's normal UI. We have different types of Notifications Toast Notification − It will show a pop-up message on the surface of the window Status Bar Notification − It will show notifications on the status bar Dialogue Notification − It is an activity related notification LockScreen Notifications In Android version 8.0 (Oreo) and above to create notifications we need to create Notification Channel. Check How to create Notification in Android
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